2005 Pontiac Grand Prix: The GXP Arrives With a Front-Drive V8

This record's own dek states that the GXP arrives for 2005 with the 5.3-liter LS4 V8, driving the front wheels. This record's own overview states that the compiled engine tables list a 3.8-liter V6 at 200 hp and 230 lb-ft, a supercharged 3.8-liter V6 at 260 hp and 280 lb-ft, and the 5.3-liter LS4 V8 at 303 hp and 323 lb-ft, all SAE net as compiled with no rpm given; it also states that no model-year production figure was found, and that US calendar-year 2005 sales of all Grand Prix were 122,398, per GoodCarBadCar's aggregator table.^1,2

This record's own keyFacts section states that in 2005 Pontiac replaced the Comp G option with the GXP, powered by the 5.3-liter LS4 V8 at 303 hp and 323 lb-ft as compiled; it also states that Pontiac's GXP catalog specifies that same LS4 as a 325-cubic-inch aluminum-block V8 with 10:1 compression and Displacement on Demand, rated 303 hp at 5,600 rpm and 323 lb-ft at 4,400 rpm, with a four-speed automatic and TAPshift paddles, Bilstein monotube struts, StabiliTrak Sport, Magnasteer II, a Performance Brake Package with vented cross-drilled rotors, and staggered 18-inch forged wheels on P255/45R18 front and P225/50R18 rear W-rated tires. A third keyFacts entry states that in March 2005 pontiac.com listed the Grand Prix sedan, GT, GTP and GTP with Competition Group Package and announced the V8 GXP was coming that spring.¹

This record's own production section carries a single row, 122,398 US sales for calendar year 2005, credited to automakers and the Automotive News Data Center and explicitly noted as calendar-year sales of all Grand Prix trims mixing model years rather than model-year production; its own notes state plainly that no model-year production figure was found. This record's own unpublishedLeads section carries a claim of GXP builds by model year, 2,019 for 2005, 5,586 for 2006, 2,501 for 2007 and 4,783 for 2008, totaling 14,889, sourced only to a search-engine summary of a forum thread with no identifiable publisher behind the linked PDF attachment; a second lead estimates about 17,000 2005 Grand Prix were built with the Competition Group package, held back since the forum poster says he forgets the exact numbers.²

This record's own prices section carries three MSRPs from pontiac.com's own March 11, 2005 capture, with destination not stated: $23,720 for the Grand Prix sedan, $25,620 for the GT, and $27,390 for the GTP. This record's own engines section carries the three entries matching the overview, the 3.8-liter standard on the Grand Prix and GT, the supercharged 3.8-liter standard on the GTP, and the LS4 5.3-liter V8 standard on the GXP. This record's own transmissions section lists a single entry, the four-speed electronically controlled overdrive automatic, the only transmission for the year, with TAPshift paddles standard on the GXP and with the GTP Competition Group.^3,4

This record's own options section itemizes the Competition Group Package for the GTP by its own full content, a Driver's Package Plus, a Lifestyle Package, a Leather Trim Package, a Premium Audio Package, Comfort and Info and Comfort and InfoTech packages, a Premium Lighting Package, and a separate GXP options list covering dual-zone automatic air conditioning, head-curtain side air bags, a Premium Audio Package, remote start, heated leather seating with UltraLux Suede inserts, CD/MP3, DVD navigation, XM, a power sunroof and an engine block heater.³

This record's own paint table lists nine colors, and this record's own interiors section carries two entries: the GXP's own standard cloth bucket seats with power six-way driver adjuster and lumbar, with heated leather and UltraLux Suede inserts available, and the Grand Prix, GT and GTP's shared Leather Trim Package with leather-appointed and heated front seats, both drawn from the same 2005 spec sheet and GXP brochure that supply this record's own engine and equipment detail elsewhere.³

This record's own specifications section gives the GXP's own engine displacement of 325 cubic inches with a 96.0 x 92.0mm bore and stroke as printed and 10:1 compression, an estimated 3,600-pound GXP curb weight, GXP front/rear track of 63.5/61.7 inches, a shared 110.5-inch wheelbase, 198.3-inch length, 71.6-inch width and 55.9-inch height, GXP tires of P255/45R18 front and P225/50R18 rear, an approximate 17-gallon fuel tank and 16-cubic-foot trunk across all models, and a 3.29:1 axle ratio for the GTP with Competition Group. This record's own performance, identification and conflicts sections are all empty for the year.³